Safety window lock



Dec. 21', 1948. A Hl E. BUNDREN lErm. I 2,456,766

SAFETY WINDOWLOCK Filed May 12, 1947 TTORNEY. I

Patented Dec. 21,v 1948 SAFETY WINDOW LOCK Harry E. Bundren and Victor A. Vicksell, Kansas City, Mo.

Application May 12, 1947, SerialNo. 747,404

6 Claims.

This invention has to do with the iield of building and construction and particularly with windows, the primary object being to provide a lock for windows operable to automatically maintain the Window in the locked condition until the operator thereof actuates certain elements to unlock the same.

It is well known by those skilled in the art that heretofore many types of locking devices have been provided for windows but for the most part, all of such locks require actuation of certain elements to move the same into the locked position. Such construction of the conventional types of Window locks leads to the common defect of being inoperable except when the operator actually remembers to lock the window when the same has been moved to the closed position.

Another defect of the common type of locking means for windows is that of providing no means for preventing further opening of the window when the same is left in the partially opened condition.

'Ihe most important object of this invention is to provide a window lock which obviates all of the aforesaid defects through the medium of a resilient member normally disposed in the path of travel of the window to limit the extent of opening thereof except when such member is actually moved out of its operating position.

Another important object of this invention is to provide a window lock having the aforesaid resilient member disposed in the path of travel of the window and having a swingable cam member mounted upon the window for movement to and from a position where the same contacts and moves the resilient member into the operative position when so desired by the operator.

Other objects of this invention include the way in which a plate is attached to the Window and having a swingable cam element afxed thereto for actuating the resilient member; the way in which such cam member is automatically moved to the inoperative position when the window is moved toward the closed position; the Way in which the swingable cam member is formed to prevent accidental movement thereof to the operative position as the window is closed; and the way in which the entire lock is made from a minimum of parts to render the same inexpensive, simple and easy to construct and to operate.

Minor objects of this invention will be made clear or become apparent during the course' of the following specification, reference being had to the accompanying drawing, wherein:

Fig. 1 is a side elevational view of a window showing the safety window lock made in accordance with the present invention attached thereto.

Fig. 2 is an enlarged, detailed, fragmentary cross-sectional View taken on line II-II of Fig. 1.

Fig 3 is a cross-sectional view taken on line III- III of Fig. 2 and looking in the direction of the arrows.

Fig. 4 is a fragmentary, detailed, side elevational view similar to that shown in Fig. 1 but on an enlarged scale.

Fig. 5 is a perspective view of the plate member and cam element per se; and

Fig. 6 is an inverted plan View of the elements shown in Fig. 5.

The safety window lock about to be described is particularly adapted for use with double-hung windows Ill and I2 of the kind illustrated in Fig. l. The lock per se comprises three main parts, namely, a plate member I4, a cam element I6 and a resilient nger or arm I8. The iinger I8 comprises a relatively narrow elongated leaf spring fastened at one end thereof to the window I0 through the medium of a pair of screws or the like 20, This finger I8 depends downwardly and outwardly from its point of connection with the window IB, as illustrated in Fig. 2 and has the lowermost end thereof normally disposed in the path of travel of the window I2.

Any number of fingers I8 maybe mounted upon the Window ID as desired, to the end that window I2 or Window I0 may be moved to any desired open position. In other Words, the uppermost of these iingers I8 should be disposed at a position Where the same will prevent opening of window I2 or window I0 more than a relatively small distance. This distance should be such as to prevent an intruder from passing his hand inwardly and to a position where he might actuate member It to prevent further opening of either the windows I 0 or I2.

The plate member I4 is provided With a pair of openings 22 and 24 for receiving a like number of screws or the like 26 and 28 respectively, serving as a means of fastening this plate member I4 to the uppermost end of the window I2. This plate member I4 and the cam element I6 attached thereto, is disposed in direct underlying relationship with the respective resilient arms I8 and a flange 30 overlaps a portion of the window I2 to cooperate with the screws 26 and 28 in maintaining rigidity in the plate member I4.

Plate I4 is provided with a pair of opposed slits 32 `and 34 for presenting a pair of flaps 36 and 38 respectively. These flaps 36 and 38 are bent upwardly to present a pair of barrels 4D and 42 for receiving a shaft 44 of the cam member I6. This shaft 44 is integral with the cam element I6 and formed by cutting a pair of notches 46 and 43 near one end thereof. A pair of notches 50 and 52 are also formed in the cam element IB and the plate Id respectively to prevent swinging of cam element I6 with respect to' plate 14 when suchis desired. Thus, cam element'IG is substantially H-shaped, the two opposed shaft portions 44 forming one leg thereof and a lip 54 being formed on the other leg as hereinafter explained.

The notch 50 is a continuation of the notchllx of cam element I6 and the notch 52 is formed in the barrel of the plate I4. When thesenotches and 52 are in the interlocking position shown in Fig. 5 which is made possible by slidingthe shaft 44 transversely with respect to plate I4, swing-ing 1 movement of l cam element HiV isy prevented. y

'Themy element levis provided with thefcurved laterally extending lip 54 which extends upwardly from-the window i12 when element I6 is inthe operati-vie.positionv andi-is disposed downwardly wheninthe .operativey position as illustrated by dotted linles in Fig-12.

A hole 56 formed in the element I6 receives the headoi screw Eby/hen cam Yelement I6 is in-the operative position shown in Fig.. V2 to prevent shifting of the element I6 due to a loose tlbetween theA shaft d4 andthe barrels 4Il andi 4.2.'when the lip 54 comes into contact withthe. respective resilient'- arms I8' asabout to be described.

In operation, it is clear that when'the element 'i6 is swung upon the plate I4 to the positionillustratedrin dotted lines in Fig. 2, the extent of' upward'movement of window I2 andthe extent.. of downward movement of Window Il) is. limited by the.v lowermost resilient arm I8 contactingY the uppermost face oi the plate I4 on window` I2. Whenit. is desired to raise or lower the windows I2 and I0 respectively, the operator. moves the cam member i@ to the full line position illustrated in Fig.. l2. As window I2 is raised or the window llowered, the curved lip 56S comes into contact with the lowermost end of the arms I8 and depresses the latter against the window In, permitting further relative movement of the windows IIlz'and I2. This same action takesplacebetween the lip 54 `and the next arm I8 as the'window-'I2 iscaused to be moved upwardly beyond the lower-v most flexed arm I8. Upon closing ofthe windows,;the arms I8 will move to the normal positidnillustrated-.in Fig, 2 automatically because of their.' resilient character as soon as the window I2 maoves out of contact therewith. As this closing y movementtakes place, and as the arms I8. move outwardly tothe normal position, the-latter come into contact with the-lip` 54 of cam I6 and auto.- matically flip the same to the dotted line position illustrated in Fig.` 2. Thus, as window .l2 and window ID are moved to the closed position, the samehecome automatically locked because the cam element I6 has. been moved by the'-arms""I-8 to the` inoperative position. The element IB will not accidentally returnto the operative position because of the polygonal cross-sectional con-tour of the shaft 44 asy illustrated in'Fig. '5. .In the event the operator desires to further prevent any possibility of the element i6 being accidentally moved to the operative position, he mayishift theelement I6 toa position where the notches aand lxicarelinterlocked. Obviously, anyvinurn'- l ber of the ngers I8 may be mounted upon the window l0 and the disposition thereof is optional.

In the drawing, and particularly Fig. 1, there has been shown a pair of locks, one mounted upon each side of the window I2 and each having corresponding fingers I8. Obviously, only one of these locks is necessary and may be mounted on either side of the windows I0 and I2. By the sametoken, if. used withfwindows where the uppermost sash I0 is immovablathe arms I8 may be disposed upon the framework of the windows and the plate I4 turned accordingly if desired.

The-advantages emanating from use of the self-locking device for windows just described,`

are numerous and although but one form thereof has been illustrated and described, it is understood that many changes may be made in details of construction without departing from the spirit of this-invention or scope of the appended claims. Having thus described the invention, what is claiJmed.Ias-.-new and .desired to-:belsecurediby LettersPatentiszl f l. -A 'loclrfon rectiliriearlylreciprocablewindows comprising.- .a platezmemb'er: .adaptedrffor attach-4 ment .tela windowztoabe.locked; a. camcelem'ent swingably securedto saidplateime-mber; and shiftable means disposed in thefpath' iotztravel ofi sai-'d window.l and :positioned to. .limit the extent of 'movement ofthefwindow in` one direction; said cam; elementj .being :movable .to `and-from .a posi'- tion @rendering saidzshiftable means .inoperable as.thef'window.is=.movediinfsaid-one direction,r said siliftab-le meansv comprising a resi-lient'stop, said cani. element being.: operable.l to depress fthe -stop cut olf-.the- .patlito-f. travel fof saidwindow 2. .A window 'lockotithe .character described, comprising a plate mountediiupcn oneendrofithe window to 'beilocked elementhaying :an: upturned flip? on one. end thereof., said element: :b er ing' .hingedly 'secu-red.. at its opposite endy tof said plate;y and `shiftabl'e` means normally `disposed''in the path of travel of the window for limiting :the extent of. movement thereof: .in one dir-e.ction, fsaid lip of the'elementsbeingengageable with-the shift?V ablefmeans for render-ing the latterinoperable as the .w-irirdmv- .mov-ed in saidA oneV directionand whenithe elem-ent is swung on the .plate to a v.pref

determi-ned pcsitionrelativentheretof.

3. A. window-flock. of. the character-described, comprising Aa. plate mounted upon-one end-*ofthe wind-ovv tofbe locked; anielement.having-.an-upe turnedlip un one' end thereof', said elementabeing hingedlysecured at` its opposite end-to saidplatee. -andfshi-ftabl-e means-normallydisposed-in the path of :trav-eli-cf the xvi-n-nicnfvffor-limitingv the exten-tof movement-thereof `iin one d-irection,- said `li-p of-.gthe element being-engageable with theshiftablemeans for rendering the latterinoperable-as` the window is moved in said one-direction and-- when -the. ele-5 mentfi's 'swung on the-fplate toiapredetermined posi-tion. relative thereto, said shiftable- 'means comprising a resilient stop capable `ofi` returning to anfoperable position when-the -vv-indcwisshift ed the opposite- 'direction-.lv v

4. A- -w-indow lock of the character described,

comprisingcea .platermcunted uponffonei end iofsthe p when the 4element is swung on the plate to a Dredetermined position relative thereto, said shift- Yable means comprising a resilient stop capable of returning to an operable position when :the window is shifted in the :opposite direction, said element being freely swingable on the plate whereby :the same is shifted to another position on the plate by the resilient stop as the latter returns to its 0perable position.

5. A window lock of the character described, comprising a lresilient member mounted with one end thereof normally in the path 0f travel of the window to be locked to limit the extent of movement of the window in one direction; and a cam element having means for swingably attaching the same to said window, said cam element engaging .the resilient member and depressing the same out ofthe path of travel of the window when the -cam element is swung to a predetermined posit-ion on the window, said resilient member re- -turning to said normal position as the window is moved toward its starting position in the opposite direction, said member swinging the cam element out of said predetermined posi-tion as the member returm to the norma1 position.

6. A window lock of the -character described, comprising a resilient member mounted with one end thereof normally in the path of travel of the 6 window to be locked to limit the extent of movement of the window in one direction; ya cam element having means for swingably attaching the same to said window, said cam element engag ing th-e resilient member and depressing the same out of the path of travel lof the window when Ithe cam element is swung to Va predetermined position on the window, said resilient member returning to said norma1 position yas the window is moved toward its starting position in the opposite dir-ection, said member swinging the @am element out of said predetermined position as the member returns to the normal position; and releasable means for holding the cam element in an inopera tive position on the window.

HARRY E. BUNDREN.

VTCTOR A. VICKSELL.

REFERENCES CITED The following references are of record in the ille of this patent:

UNITED STATES PATENTS Number Name Date 15,911 Young Oct. 14, 1856 1,181,518 Ghormley May 2, 1916 1,763,638 Bonner June 17, 1930 

